at constant pressure and temperature if volume is double than its density become
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At constant temperature and pressure, if the volume of given mass of a gas is doubled, what becomes of its density?
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Cristobal Cortes, Professor, Thermal Engineering at University of Zaragoza (1989-present)
Answered 2 years ago · Author has 1.5K answers and 748.5K answer views
OK, I see confusing things here. If temperature and pressure are constant, any gas under any circumstance will have the same density. Actually, you can switch “gas” by “substance” in the statement above. In thermodynamics, we call this the p-v-T equation: any substance, in a single phase exhibits a single-valued function that gives you any of p, v, T as a function of the other two. Thus, if p and T are constants, also the specific volume v is, and so its inverse, that is the density.
Since density = mass/volume, it follows that for a constant mass, p and T, you CANNOT double the volume.
Note that this is true equally for ideal gases, but you don’t need to invoke the ideal gas Eq. to argue.
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